Breaker point grinder



Feb. 28, 1939. H. w. KULP ET AL BREAKER PONT GRINDER Filed Dec. 14. 1937 ll`llll |1111 rPatented Feb. 28, 1939 BREAKER POINTl GRINDER' Harry WpKulp and Martin C. Dellinger, Lancaster,-Pa.\, assignors to K-DVManufacturing Company, Lancaster, Pa., a corporation-of Pennsylvania,

' Application December 14, 1937, serial No. 179,753

9 Claims.

' 'Ihis invention relates to breaker point grinders, such for example as shown in the Patent Number 1,917,863, Agranted July 11, 1933, to Herbert H.1-Wal ters, although it is capable of use in other connectionsand other fields and by 'this application We seek `to define and protect our invention for use Vin'any'leld in which it is capable of, functioning.

The `primary yobjects 'of the present invention l are, to provide a built up` sheet metal frame having a hand grip portion, a magazine portion for entra grinding elements anda bifurcated portiOnfor mounting thejdriving ymeans and the drivenA grinder, all said portions being rigidly f connectedV together and particularly lending themselves to very economical production on a large `quantity basis by sheet metal stamping operations;v to provide a drive shaft in associationy with a drive crank which by easy and quick 20 shifting of the crank from one end portion of the shaft to the other may be selectively turned from the right hand or the left hand to facilitate operation of the tool in cramped quarters and on all makes of automobiles; and to provide in vcombination with'the''bifurcated member means preferably permanently associated therewith for positively at will moving the lower end portion of one` of the furcatlons thereoffboth vfromand toward the lother to permit the removal of a grinding element Iand its replacement by a new element and the holding of thenew grinding element and of the operative parts in the proper operating relationship.

In this application we show and describe only the preferred embodiment of our invention simply by Wayy of illustration of the practice thereof as by law required. However, We recognize that our invention is capable of other and different embodiments, and that the various details there- 4()4 of may be modified in numerous ways, all without departing from our said invention and therefore, the drawing and descriptions herein are to be considered as merely illustrative and not as exclusive. f

In the accompanying drawing:

Figure 1 represents a front elevation of al grinding tool embodying our inventiony 'Figure 2, a side elevation thereof;

Figure 3, a View similar to Figure 1 with the near side of the bifurcated portion and the drive crankl omitted and the magazine in section together with the adjacent portion of the handle;

Figure 4, an enlarged fragmentary detail view of Vthe lower portion of the rigid furcation, this view being taken in such a plane as to show the details of the mounting of the grinding wheel A on the shaft I1 andr engaged by the drive forks Figure, a sectional view on the line 5--5 of Figure 4, looking in the direction of the arrows and assurnir'igk both furcations of the bifurcated fork to be present butispread, or the resilient furcationv spread from the rrigid furcation, the thrust screw and the drive forks being shown in side elevation;

Figure 6, a sectional view on the line 6-6 of Figure 7 looking in the direction of the arrows;

Figure 7, an enlarged detail side elevation View of the hub end portion of the drive crank as applied to one end of the drive shaft 9, the friction gripping spring I3 being shown in dotted lines; and

Figure 8, a sectional View on the line 8 8 -of Figure 7, looking in the direction of the arrows.

Referring now in detail to the drawing, the

frame of the toolcomprises a loop form strap metal or stamp sheet metal handle portion I; a loop yform or generally round magazine body portion formed of a band or ribbon of sheet metal and having a flat lower side; and a bifurcated frame portion 'I having a at web or bridge connecting the upper portions of its twofurcations, according to the preferred embodiment illustrated. ,f Preferably the ends or' end portions of the magazine body 2 will have their adjacent opposed faces` brought into Contact and disposed between the downwardly presented end portions of the loop I and secured therebetween by means of rivets 3 passing through said end portions of said loop I and said body 2, or by any other usual or suitable means serving to connect these two portions rigidly together Similarly the lower flat portion of the body 2 and the bridge of the bifurcated portiony 'I are rigidly connected together against relative movement in any suitable known manner, as by a rivet 4 or any other usual or suitable means.

The open side faces of the bandportion 2 or magazine portion may rbe closed in any desired suitable manner, as for instance by means of plates or covers 5 provided With inwardly presented spaced resilient lugs or fingers 6 engaging, in the vembodiment illustrated, the outer face of said body 2 and serving to hold the respective plates or covers 5 against the adjacent side edges respectively of said portion 2.

The drive shaft 9 isrotatably mounted in the upper portion of the bifurcated portion 'I with its en d portions extending appreciably beyond the outer side faces of the respective furcations to selectively receive the drive crank handle II which is preferably provided with a handle or knob I4 as usual. The protruding end portions of the shaft 9 are preferably formed with a flattened face as at I to t in registering correspondingly shaped and sized holes in theinner or hub end of the crank II and receives on its f medial portion between the opposed faces of the furcations of said portions 1 the drive pinion mounted in any suitable manner upon said shaft 9 to turn therewith, a drive chain I5 passing about said pinion 8 and about the pinion I6 preferably integral with the driven shaft I1 mounted in the lower portion of said bifurcated portion 1 serving to drive the shaft I1 from the shaft 9.

Preferably the drive end or hub portion of the crank II will be looped back upon itself as at I2, as Well illustrated in Figure 8, and a suitable loop form I3 having one loop formation serving to hold it in place between the opposed faces of the hub portions of the crank Il anda further loop portion lying fiat against the upper face of portion I2 of the handle and slightly intersecting the side portions ofthe opening therein to frictionally engage the opposed peripheral face portions of the end portion of the shaft 9 to which the crank II may be applied is preferably provided and preferably of the construction in general as illustrated. Preferably this spring is anchored in position by having its end portions extend through perforations in the crank I I as illustrated. However, the precise construction of this spring is not a vital factor and it may be of any structure such as will suflice to exert a resilient pressure against the shaft 9. Also, as stated, it is pref-erred, but it is not essential and it may be entirely omitted.

The lower or driven shaft I1 preferably has the driven pinion I6 formed integral therewith, the grinder collar I9 preferably being formed separately of a sheet metal stamping and being shrunk, or welded, or otherwise permanently mounted on the shaft I1 to rotate or turn therewith, and the drive forks 20 extend from the peripheral outer portions of the collar I9 parallel to the axis of the shaft I1 and away from the pinion IB so as to t into the cooperating holes a of a grinding or filing element A slipped over the end of the shaft I1, all as well shown in Figure 5.

Normally a shaft I1 has its end portions received in aligned openings or bearings inthe lower portions of the bifurcated portion or fork 1, with the axis of the shaft I1 extending perpendicularly, or substantially perpendicularly, to said furcations, and with the grinding disc A as driven by theshaft I1 disposed in close adjacency to the opening B for one of the breaker points to the end that the grinder disc A will extend between the opposed faces of the breaker points during the rotation of the grinder A4 when actually applied to perform the work for which it is primarily intended and as referred to in more detail in the Walters patent above referred to. Y

In order to permit or facilitate the quick and easy removal of a grinder A and its replacement by another grinder wheel A, according to the size of grinder wheel desired and according Yto the condition of the particular grinder, it is desirable to provide some easy and simple means for separating Athe end of the shaft I1 adjacent the drive forks 2B from the adjacent furcation of the fork 1 or frame 1. Also, to avoid possible loss of parts the pull of the during such separation and waste of time and annoyance instant to such loss of parts, it is desirable to provide some means for positively preventing the separation of the shaft I1 from the fork or frame 1 and to prevent the separation of the pinion I6 and the drive collar I9 with its forks 20 from the shaft I1. Preferably these objects are accomplished by permanently connecting the end of the shaft I1 to the rigid Yfurcation of the fork 1 in such manner that while permanently connected therewith it shall be free to rotate therein and may slightly swing or wobble in relation thereto to accommodate itself to drive chain when the other end of the shaft I1 is left free by the removal therefrom of the resilient furcation 22 of the frame 1. The shaft I1 may be permanentlyrotatively connected with said rigid furcation of the chain or fork 1 by passing the end of the shaft 1 through a suitable hole or bearing in the said rigid furcation and thereafter upsetting or riveting over the end of the shaft as shown at IB yof Figure 5, care being taken however not to upset or rivet over the end to such a degree as to bind the shaft I1 in its mounting in said rigid furcation against rotation therein.

In order to provide for the proper supporting and positioning of the free 'end of the shaft I1 while the same is being rotated during the operation of the tool upon the breaker points or other elements one leg of the rigid portion of the fork or bifurcation 1 will be made very much shorter than'the other and to this shortened leg or furcation will .be preferably secured a resilient spring steel portion or leaf spring 22 preferably by means of two spaced rivets 24 to rigidly secure the upper end of said leaf spring 22 to the lower portion of said shortened furcation of the fork 1. This leaf Vspring 22 will extend down below the end of the rigid furcation and will be formed with the opening B to receive one of the breaker points as above referred to and above said opening B it will be formed with a perforation or bearing opening 23 to receive and constitute a bearing for the free end of the shaft I1, when said shaft extends perpendicularly, or substantially perpendicularly to both of the sides of the bifurcation, in other words to the rigid arm or leg of the bifurcation and to the leaf spring 22 when the parts are in the position shown in Figure 2.

In order to positively spread the spring 22 or force it away from the rigid leg or varm of the bifurcation 1 to permit the insertion or removal of a grinder wheel A and to positively pull the leaf spring 22 back into proper grinding relation after the new grinding wheel A has been applied, some positive pushing and pulling means is provided, and to accomplish the foregoing move-- ment and results a pushing and pulling screw Z is preferably employed, being threaded through the rigid arm or leg of the frame or bifurcation 1 andphaving a reduced end portion passing through a corresponding opening in the leaf spring 22, preferably a washer 29 being applied against the outer face of the'leaf spring 22 about the reduced portion of the screw 25 and the extreme end portion of said reduced portion being thereafter riveted over or upset to permanently secure the washer to the screw 25. As thus assembled the screw 25 on being screwed into or through the rigid arm of the bifurcation 1, bearingV with its shoulder 21 against the inner face of the leaf spring 22 and forces or spreads the same away frornsaid rigid arm and thus removes fio the lowerportion of said spring 22 from the end Aofthesh'aft 11,' continued inward turningof the screw resulting in spreading the leaf spring 22 suiiiciently from" the tip 2l of the shaft' Il as to leave a clearance therebetween of such distance orjsize as'may be de'sirednby the operator, providingample'room for the removal and insertion orapplication of a grinding element jA. kWhen this 'has been accomplished the screw 25 is screwed outward or in the reverse direction to let the spring r22 straighten out orspring back to ward its former position.,` When the spring 22 as moved b'acl' to such point that the Yedge of theupper portion of its hole orbearing 23 fstrikes against the rounded Vtip 2| of the shaft Il it may come to ward turning'of the screw causes the washer 28 f tobear against the outer face of ther leaf spring 22 and thereafter continued voutward turning of the screw 25` will result in positively pulling the spring 22 towardthe rigid arm of the bifurcation 'i' andthis y'added tension ony the springy 22 will cause thesame to bear against the rounded end 2i of the sha-ftd?, which rounded end will ride downward until the .shaft I7 centers itself in said hole or bearing`23, ythe ,outward turning of the screw 25 preferablybeing continued until the leaf spring 22 assumes the position illustrated in Figure 2 with the `tips Vof the lforks or fingers 2? touching the opposed inner face of leaf sprinar 22 or substantially touching the same or infinitesimally spaced therefrom.

t is thought thatthe operation and construction'. ofthe preferred embodiment illustrated are clear from the foregoing description. n it is not essential to the mounting of the lower or driven shaft .H andto the association therewith for relative movement of the leaf spring 22 that any magazine suchas shown should be pro vided or that theconstruction and association of the loop. and the magazine should `be provided illustrated or that a loop form of handle should he provided nor is it essential to the construction and operation of the magazine that the loop should be provided or that the special details of the driven-shaft or-of the association therewith of the leaf spring 22 should be provided or any other ymeans serving the same function should fbeprovided. Similarly, it is not essential to the operation and cooperation of the crank il with the drive shaft 9 that any of the othervfeatures in detail as mentioned shouldfbe provided or that the magazine should be provided or that the combination between the leaf spring 22 and the lower shaft il should be provided;

So `far asthe combination of the driven shaft ilr with the relatively movable lower end portion ofl the spring 22 isconcerned it is only essential that said lower portion shall be movable relative to the shaft 'l and in ther direction' of the axis thereof and it is not essential that said shaft shall be mounted in the rigid leg or arm of the furcation 1, with a. wobbling or swinging capacity, nor is it` essential that an operating screw such as' 25 beemployed. `Itwould suffice if the lower end'of 22 Were swingable relative to the shaft` i?, whether said element 22 were a spring or were a hinged member and any means for accomplishing this swinging action and for holding it in normal operative position during the grinding operation of the tool would sufiice. It is not absolutely essential that the shaft Il be permanently mounted in either arm or leg of the frame or bifurcation 1, though this is preferred.

rest at such point until continued outf Weclaim:` 1. A tool of the character described comprising a frame consisting cfa/strap metal loop form hand grip having substantially parallel end portions, an intermediate magazine formed ywith a band form sheetmetalfbody portion having a iattened portion and substantially parallel end portions, a fork having substantially parallel furcatio-ns oonnectedat their upper ends by a bridge disposed substantially parallel toeand engaging said flattened portion of the magazine body, means for rigidly securing said flattened portion and said bridge together, and means for rigidly securing the ends of said magazine body between the ends of said hand grip,.in combination with a drive shaft mounted in said fork adjacent the bridge thereof, a driven shaft mounted for rotain the'lower portions of said furcations, means on said driven shaft for engaging and driving a friction-element, and drive connections for driving said driven shaft from said drive shaft.

2. A tool of the character described comprising a frame consisting of a strap metal loop form hand grip having substantially parallel end portions, an intermediate magazine formed with a band form sheet metal body portion having a iiattened portion and substantially parallel end portions, a fcrkhaving substantially parallel furcations connected at their upper ends by a bridge disposed substantially Iparallel'to and engaging said flattened portion vof s the` magazine body,

.means for rigidlysccuring said iiattened portion and said bridge together and means for rigidly securing the ends of said magazine body between the ends of said hand grip. Y

3. A tool of the character described comprising a bifurcated frame formed with a long furcation and a short furcation connected at their upper ends by a rigid bridge and being of relatively rigid sheet metal, a drive shaft mounted for rotation in said furcations adjacent said bridge,

a pinion mounted onk said shaft between said furcations to turn therewith, a driven shaft permanently mounted by one ,end portion for rotation in the lower yend portionof said long furcation, a pinion provided on said driven shaft to turn therewith, an endless band fieXible drive means for driving said driven pinion from said drive pinion,r a thin substantially sheet form rotary working element, and means provided on said driven shaft for engaging and rotating said element, said driven shaft having a rounded selfcentering freeend, in combination with a leaf spring rigidly connected at, its upper end portion to said short furcation andv extending down beyond the axis of the driven shaft in its normal driven position and being formed .with a hole in transverse registry with the point of mounting of `said driven shaft in said long furcation, said hole normally receiving and affording a bearing for the free end of said driven shaft, and a screw threaded through said long furcation and having a reduced neck loosely extending through said leaf spring with a shoulder to engage the inner face of Asaid leaf spring to force the latter axially off of the end of said driven shaft to permit the removal and replacement of a friction element, and means carried `by said screw to engage the outer face of said leaf spring to positively pull the same back over the free end of said driven shaft.

4. A tool of the character described comprising a bifurcated fram-e formed with a long furcation and short furcation connected at their upper ends by an integral bridge and being of relatively rigid sheet metal, a drive shaft mounted for rotation in said furcations adjacent said bridge, and having a portion extending beyond the outer face of each furcation to selectively be engaged by an operating element, a driven shaft permanently mounted by one end portion for rotation in the lower end portion of said long furcation, means for driving said pinion from said drive pinion, said driven shaft having a rounded self-centering free end, in combination with a leaf spring rigidly connected at its upper end portion to said short l furcation and extending down beyond the axis of the driven shaft in its normal driven position and being formed with a hole in transverse registr with the point of mounting of said driven shaft in said long furcation, said hole normally receiving and affording a bearing for the free end of said driven shaft, and means for positively pushing the lower portion of said leaf spring away from and pulling it toward said rigid furcation to permit the removal and replacement of a friction element.

5. A tool of the character described comprising a bifurcated frame, al drive mounted for rotation in the upper part of said frame, a driven shaft mounted in the lower portion of said frame, means for driving said driven shaft from said drive shaft, in combination Ywith means permanently connected with each of the furcations of said frame for positively pushing and pulling to cause relative movement between said furcations in one direction to permit free unobstructed access to one end of the driven shaft to remove or replace a driven element therefrom or thereon and in the reverse direction to cause the said end o'f said driven shaft to be received in a supporting bear- 6. A tool of the character d-escribed comprising a bifurcated frame, a drive mounted for rotation in the upper part of said frame, a driven shaft mounted in the lower portion of said frame, means for driving said driven shaft from said drive shaft, in combination with means permanently connected with one of the furcations of said frame for positively pushing and pulling to cause relative movement between said furcations in one direction to permit free unobstructed access to one end of the driven shaft to remove or replace a driven element therefrom or thereon and in the reverse direction to cause the said end of said driven shaft to be received in a supporting bearing.

7. A tool comprising a frame member, a shaft mounted for rotation in said member and having end portions extending beyond both outer faces of said member, said extending end portions being irregular in cross-section and having their extreme end portions tapered, in combination with an operating crank handle having its hub end bent to lap back together with the main portion to provide two substantially parallel metal webs, and being formed with registering irregular form hub openings in said Webs correspondingin shape to the cross-sectional shape of each said end portion of the shaft and being of such size as to selectively make a snug sliding fit thereon, anda loop form spring received in the pocket formed between the webs of the hub end of said crank handle and having portions normally intersecting the opening in one of said webs to be engaged and spread by the extreme tapered end portion of one end of said shaft as the crank handle is applied thereto and, to yieldingly frictionally grip the shaft to prevent the crank handle from dropping by gravity therefrom.

8. A tool comprising a frame member, a shaft mounted for rotation in said member and having an end'portion extending beyond an outer face of said member, said extending end portion being irregular in cross-section and having its extreme endV portion tapered, in combination with an operating crank handle formed with an irregular form hub opening corresponding in shape to the cross-sectional shape of said end portion of the shaft and being of such size as to make a snug sliding fit thereon, and a spring having a portion normally intersecting said opening in one of said webs to be engaged and sprung by the extreme tapered end portionof said shaft asV the crank handle is applied thereto and, to yieldingly frictionally grip the shaft to prevent the crank handle from dropping by gravity therefrom.

9. A tool of the character described comprising a bifurcated frame formed with a long furcation and short furcation connected at their upper ends by an integral bridge and being of relatively rigid sheet metal, a drive shaft mounted for ro tation in said furcations adjacent said bridge, and having a portion extending beyond the outer face of each furcation to selectively be engaged by an operating element, a pinion mounted on said shaft between said furcations to turn therewith, a driven shaft permanently mounted by one end portion for rotation in the lowerend portion of said long furcation, a pinion. provided on said driven shaft to turn therewith, an endless band flexible driving means for driving said driven pinion from said drive pinion and means provided on said driven shaft for engaging and rotating a grinding element, said driven shaft having a rounded self-centering free end, in combination with a leaf spring rigidly connected at its upper end portion to said short furcation and extending down beyond` the axis of the driven shaft in its normal driven position and being formed with a hole in transverse registry with the point of mounting of said driven shaft in said long furcation, said hole normally receiving and affording a bearing for the free end of said driven shaft, and a screw threaded through said long furcation and having a reduced neck loosely extending through said leaf spring with a shoulder to engage the inner face of said leaf spring to force the latter axially off of the end of said driven shaft to permit the removal and replacement of a friction element, and means carried by said screw to engage the outer face of said leaf spring to positively pull the same back over th-e free end of said driven shaft. 1 Y

HARRY W. KULP.

MARTIN C. DELLINGER. 

